JPS6036867Y2 - refrigerator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a refrigerator having a function of rapidly cooling a freezer compartment.

Conventionally, in refrigerators, the operation of the compressor is controlled by a temperature switch for the freezer compartment, while a solenoid valve is controlled by the temperature switch for the refrigerator compartment to supply refrigerant to both the cooler for the freezer compartment and the cooler for the refrigerator compartment. There is a refrigerating cycle in which the refrigerating room temperature is lowered to a set temperature and then the refrigerating temperature is supplied only to the freezer cooler.

Some of these devices are equipped with a so-called quick-freezing device, which allows food to be quickly frozen by quickly cooling the inside of the freezer immediately after storing the food. From the start of operation, the refrigerant supply path is switched using a solenoid valve so that refrigerant is supplied only to the freezer compartment cooler.

However, according to this configuration, immediately after the quick freezing operation is completed, the inside of the freezer compartment is in a sufficiently cold state, so the compressor stop time immediately after this is also extended, and the temperature inside the refrigerator room is low at the time when the quick freezing operation is completed. Even if the temperature was already high, the compressor was not restarted as described above, so there was a risk that the food in the refrigerator compartment would deteriorate.

The present invention was made to eliminate the above drawbacks,
The purpose of this is to immediately put the refrigerator compartment into a state where cooling operation is possible even immediately after the quick freezing operation of the freezer compartment is completed, if the temperature of the refrigerator compartment is such that cooling operation is required. An object of the present invention is to provide a refrigerator that can prevent abnormal temperature rise in a refrigerator compartment.

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes an insulating box in which a freezer compartment 3 and a refrigerator compartment 4 are separated by an insulating partition wall 2, and the freezer compartment 3 is formed by a box-shaped freezer compartment cooler 5; A refrigerator compartment cooler 6 is disposed within the refrigerator compartment 4.

A drainage lower is formed at the back of the bottom of the freezer compartment cooler 5, and water from defrosting is drained from there through a drainage pipe 8 provided on the partition wall 2 to a drainage gutter 9 in the refrigerator compartment 4. Accepted,
They are also guided outside the warehouse.

lea is a layer for the freezer compartment, and 10b is a door for the refrigerator compartment.

Next, in the refrigeration cycle shown in FIG. 2, the discharge port 12 of the compressor 11 is connected to the main capillary 1
4, the outlet section 15 of the main capillary tube 14 is connected to the suction port section 18 of the compressor 11 via the auxiliary capillary tube 16, the refrigerator compartment cooler 6, the connecting pipe 17 and the freezer compartment cooler 5, and further The outlet section 15 of the main capillary tube 14 is also connected to the inlet section of the freezer compartment cooler 5 via a two-way solenoid valve 19 and a part of a connecting pipe 17, which constitutes a flow path switching device.

Here, the flow path having the auxiliary capillary tube 16 constitutes a first refrigerant supply path 20 that supplies refrigerant in series to both the refrigerator compartment cooler 6 and the freezer compartment cooler 5, and the flow path having the solenoid valve 19. constitutes a second refrigerant supply path 21 that supplies refrigerant only to the freezer compartment cooler 5.

And the second refrigerant supply path 2 when the solenoid valve 19 is opened.
1 is set to be smaller than the series flow resistance between the auxiliary capillary tube 16 and the refrigerator cooler 6. Therefore, as the compressor 11 operates, the liquid is liquefied in the condenser 13, and the outlet of the main capillary tube 14 is liquefied. The liquid refrigerant discharged from the section 15 is
When the solenoid valve 19 is open, the refrigerant is supplied to the second refrigerant supply path 21, and when the solenoid valve 19 is closed, the refrigerant is supplied to the first refrigerant supply path 20.

In the control circuit shown in FIG. 3, 22 has busbars 23 at both ends.
．． 24 is a connected AC power source, 25 is a compressor motor, 26 is a temperature switch for the freezer compartment, and 27 is a temperature switch for the refrigerator compartment.

In this freezing room temperature switch 26, the movable contact piece C is connected to the bus bar 23, and each of the fixed contact pieces a and b is connected to the bus bar 24 via a compressor motor 25 and a heat-sensitive tube heater 2B, respectively.

One end of the refrigerator temperature switch 27 is connected to the bus bar 23, and the other end is connected to the solenoid valve 19 via a terminal 29.
, a drain pipe heater 30 and a connecting pipe heater 31 are connected to the bus bar 24 in parallel.

32 is a timer including a timer motor 33 and a first switch element 34a, a second switch element 34b, and a third switch element 34c which are closed during the period indicated by the hatched area in FIG. 4; 35 is a timer that is operated manually. This is a quick freezing switch that turns on only while pressure is applied.

The timer motor 33 is connected between the busbars 23 and 24 via a quick freezing switch 35 connected in parallel with a third switch element 34C, and a first switch element 34C.
a is connected in parallel with the contact piece (c-a) of the temperature switch 26 for the freezer compartment, and constitutes a compressor forced operation circuit 36.

Further, the second switch element 34b is connected between the terminal 29 and the bus bar 23.

Here, the temperature switch 26 for the freezer compartment is connected to the sensitive zone 2.
6A is located at the lower back of the freezer compartment cooler 5, and the switch 26 is connected between contact pieces (c and a) when it is turned on for (-18°C) with the inside of the refrigerator set to the normal temperature. , (−
22°C).

In addition, between the contacts (c and a) of the temperature switch 27 for the refrigerator compartment, the temperature switch 27 for the refrigerator compartment is connected to the cooler 6
(+3.5°C) and turns on when the air temperature near the refrigerator compartment cooler 6 (-7.5°C).

On the other hand, in the timer 32, the first switch element 34
a continues to be closed for the total time of the set freezing time T1, which is the time required to quickly freeze the freezer compartment 3, and the time T2, which is the time required to cool the refrigerator compartment 4 and its cooler 6 to the set temperature, Further, the second switch element 34b is closed only for the set freezing time T1, and the third switch element 34c is closed for the same time as the first switch element 34a.

On the other hand, the heat-sensitive tube heater 28 is connected to the compressor 11 when the contact piece (c-b) of the freezer compartment temperature switch 26 is turned on.
This is to shorten the off cycle of the compressor by heating the heat-sensitive portion 26A of the switch 26 when the switch 26 is energized during the stop period.

Further, the connecting pipe heater 31 and the drain pipe heater 30 are energized while the temperature switch 27 for the refrigerator compartment is on, and are used to heat the connecting pipe 17 and the drain pipe 8 to prevent them from frosting or freezing. It is something.

Next, the operation of the above configuration will be explained.

In a normal cooling operation state in which the rapid freezing switch 35 is not turned on, when both the freezing compartment 3 and the refrigerator compartment 4 are at or above the set temperature, the freezing compartment temperature switch 2 is turned on.
6 is on between contact pieces (C-a), the compressor motor 25 is being driven, and the temperature switch 27 for the refrigerator compartment is off and the solenoid valve 19 is closed.
Therefore, since the solenoid valve 19 is closed, the refrigerant discharged from the main capillary tube 14 is provided to the first refrigerant supply path 20, and both the freezer compartment cooler 5 and the refrigerator compartment cooler 6 exhibit a cooling effect. There is.

And the air temperature near the refrigerator cooler 6 is (-7.5℃)
When the temperature drops below, the refrigerator compartment temperature switch 27 is turned on and the solenoid valve 19 is energized, so the refrigerant is supplied only to the freezer compartment cooler 5 via the second refrigerant supply path 21 and continues to the freezer compartment. 3 cooling operation is performed, and the compressor 11 switches the freezer compartment temperature switch 26 to the contact piece (C
-a) It is stopped by being turned off during.

After this, the temperature of the freezer compartment cooler 5 gradually rises and when it reaches (-18°C) or higher, the contact piece (C-a) of the freezer compartment temperature switch 26 is turned on and the compressor 11 is driven. The cooling operation of the freezer compartment 3 is started, and the cooling operation of the refrigerator compartment 4 is started.
The temperature also gradually rises, and the refrigerator compartment cooler 6 reaches (+3.
5° C.) or higher, the refrigerator compartment temperature switch 27 is turned off, the solenoid valve 19 is closed, and the refrigerator compartment 4 and the freezer compartment 3 are operated for cooling.

Next, the quick freezing operation will be explained. In this case, the quick freezing switch 35 is temporarily turned on.

Then, the timer motor 33 is energized at this time to close each of the switch elements 34a, 34b, and 34c, and from then on, power is continued to be supplied by the third switch element 34c until time t2, and the timer motor 33 enters the timekeeping operation state.

Now, when the switch element 34a is closed, the compressor forced operation circuit 36 is formed, and the compressor motor 25 and therefore the compressor 11 are forcedly operated independently of the freezing room temperature switch 26, and the second switch element 3
4b is closed and the solenoid valve 19 is energized and held in the open state, and as a result, the refrigerant discharged from the main capillary tube 14 is supplied only to the freezer compartment cooler 5. This is the quick freezing operation that is performed for the set freezing time. It continues until T1, that is, the time (.

When this time is reached, the second switch element 34
Since b is opened, the electromagnetic valve 19 is thereafter controlled to be energized only by the temperature switch 27 for the refrigerator compartment.

Then, the time t when the second switch element 34b is opened corresponds to the completion time of the quick freezing operation, and thereafter the compressor 11 continues to be in the forced operation state for a predetermined time T2.

Therefore, at the time when the quick freezing operation is completed, or at a time slightly later than this, if the temperature inside the refrigerator compartment 4 is higher than the set temperature, the refrigerator compartment temperature switch 27 is turned off and the solenoid valve is turned off. Since the refrigerant 19 is closed, the refrigerant is supplied to the first refrigerant supply path 20 and the cooling operation of the refrigerating compartment 4 is performed. It will be done.

As described above, according to the present invention, the compressor is controlled by the freezer temperature switch and selectively supplies refrigerant to both the freezer compartment cooler and the refrigerator compartment cooler, and only to the freezer compartment cooler. In a configuration in which the flow path switching device is controlled by a refrigerator room power switch, even if quick freezing operation is performed in which refrigerant is supplied only to the freezer compartment cooler from the beginning of compressor operation, the quick freezing operation It is possible to provide a refrigerator in which the cooling operation for the refrigerator compartment is enabled immediately after the completion of the cooling operation, and therefore the abnormal temperature rise in the refrigerator compartment due to the quick freezing operation can be prevented as much as possible.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal side view showing an embodiment of the present invention, FIG. 2 is a system diagram of its refrigeration cycle, FIG. 3 is a wiring diagram of a control circuit, and FIG. 4 is a time chart. In the figure, 3 is a freezer compartment, 4 is a refrigerator compartment, 5 is a cooler for the freezer compartment,
6 is a cooler for the refrigerator compartment, 11 is a compressor, 13 is a condenser, 19 is a solenoid valve (flow path switching device), 20 is a first refrigerant supply path, 21 is a second refrigerant supply path, and 26 is for the freezer compartment. A temperature switch, 27 is a temperature switch for the refrigerator compartment, 32 is a timer, 34a is a first switch element, 34b is a second switch element, and 36 is a compressor forced operation circuit.

Claims (1)

[Scope of utility model registration request] A temperature switch for the freezer compartment that controls the operation of the compressor, a first refrigerant supply line that supplies refrigerant to both the freezer cooler and the refrigerator cooler, and a second refrigerant supply line that supplies refrigerant only to the freezer cooler. A refrigerating room temperature switch that controls a flow path switching device that switches between the refrigerant supply path and the refrigerant supply path to cool the refrigerating room and the freezing room. Wm on timer
a first switch element that forms a forced operation circuit for the compressor during a set time; and a first switch element provided in the timer that causes the flow path switching device to enter a second refrigerant supply path formation state in connection with the formation of the forced operation circuit; The second switch element is held for a set time, and the second switch element is set to complete the set time a predetermined time before the first switch element. refrigerator.